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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.async_read_at"></a><a class="link" href="async_read_at.html" title="async_read_at">async_read_at</a>
</h3></div></div></div>
<p>
        <a class="indexterm" name="idp30699792"></a> 
Start an asynchronous operation to read a certain amount of
        data at the specified offset.
      </p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">&gt;</span>
<span class="keyword">void</span> <a class="link" href="async_read_at/overload1.html" title="async_read_at (1 of 4 overloads)">async_read_at</a><span class="special">(</span>
    <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&amp;</span> <span class="identifier">buffers</span><span class="special">,</span>
    <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
  <span class="emphasis"><em>&#187; <a class="link" href="async_read_at/overload1.html" title="async_read_at (1 of 4 overloads)">more...</a></em></span>

<span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
    <span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">&gt;</span>
<span class="keyword">void</span> <a class="link" href="async_read_at/overload2.html" title="async_read_at (2 of 4 overloads)">async_read_at</a><span class="special">(</span>
    <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&amp;</span> <span class="identifier">buffers</span><span class="special">,</span>
    <span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
    <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
  <span class="emphasis"><em>&#187; <a class="link" href="async_read_at/overload2.html" title="async_read_at (2 of 4 overloads)">more...</a></em></span>

<span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
    <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">&gt;</span>
<span class="keyword">void</span> <a class="link" href="async_read_at/overload3.html" title="async_read_at (3 of 4 overloads)">async_read_at</a><span class="special">(</span>
    <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
    <span class="identifier">basic_streambuf</span><span class="special">&lt;</span> <span class="identifier">Allocator</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">b</span><span class="special">,</span>
    <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
  <span class="emphasis"><em>&#187; <a class="link" href="async_read_at/overload3.html" title="async_read_at (3 of 4 overloads)">more...</a></em></span>

<span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <a class="link" href="AsyncRandomAccessReadDevice.html" title="Buffer-oriented asynchronous random-access read device requirements">AsyncRandomAccessReadDevice</a><span class="special">,</span>
    <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">,</span>
    <span class="keyword">typename</span> <span class="identifier">CompletionCondition</span><span class="special">,</span>
    <span class="keyword">typename</span> <a class="link" href="ReadHandler.html" title="Read handler requirements">ReadHandler</a><span class="special">&gt;</span>
<span class="keyword">void</span> <a class="link" href="async_read_at/overload4.html" title="async_read_at (4 of 4 overloads)">async_read_at</a><span class="special">(</span>
    <span class="identifier">AsyncRandomAccessReadDevice</span> <span class="special">&amp;</span> <span class="identifier">d</span><span class="special">,</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">offset</span><span class="special">,</span>
    <span class="identifier">basic_streambuf</span><span class="special">&lt;</span> <span class="identifier">Allocator</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">b</span><span class="special">,</span>
    <span class="identifier">CompletionCondition</span> <span class="identifier">completion_condition</span><span class="special">,</span>
    <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
  <span class="emphasis"><em>&#187; <a class="link" href="async_read_at/overload4.html" title="async_read_at (4 of 4 overloads)">more...</a></em></span>
</pre>
<h5>
<a name="boost_asio.reference.async_read_at.h0"></a>
        <span><a name="boost_asio.reference.async_read_at.requirements"></a></span><a class="link" href="async_read_at.html#boost_asio.reference.async_read_at.requirements">Requirements</a>
      </h5>
<p>
        <span class="bold"><strong>Header: </strong></span><code class="literal">boost/asio/read_at.hpp</code>
      </p>
<p>
        <span class="bold"><strong>Convenience header: </strong></span><code class="literal">boost/asio.hpp</code>
      </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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